Digester.



mGEsTEn. (Appljcation led Apr. 18, 1902.) (No lludel.)

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UNITED STATES ATENT OFFICE.

ARTHUR GIESLER, OF DAYTON, OHIO, ASSIGNOR TO THE STILWELL-BIERCE daSMITH-VAILE CO., OF'DAYTON, OHIO, A CORPORATION.

DIGESTER.

` SPECIFICATION forming part of Letters Patent N o. 712,127, datedOctober 28, 1902.

Application iled April 18, 1902. Serial No. 103,507. (No model.)

To all whom it may con/cern: Y

Be it known that LARTHUR GIEsLEE, a citizen of the United States,residing at Dayton, in the county of Montgomery and State lof Ohio, haveinvented'certain new and useful Improvements in Digesters; and I dodeclare the following to be a full, clear, and exact description of theinvention, such as willenable others skilled in the art to which itvap-1o pertains to make and use the same, reference being had to theaccompanying drawing, and to the letters of reference marked thereon,which forms a part of this specification.

This invention relates to improvements in I5 apparatus for digesting andrendering oil or grease from meats, iish, &c.

The invention has speciiic reference to means for properly supportingthe interior shell of the digester, so that the said interior zo shellmay be free to expand and contract under the varying degrees of heatintroduced thereto. In practice the digester is filled with the materialfrom whichv the grease, oils,'or fats are to be extracted, the weight ofsuch material varying often between from five to ten tons. Such weightmust be sustained in the inner shell, and if a proper provision is notmade forsustaining the inner shell and at 3o the same time permittingsaid inner shell to contract and expand f reely the same will becomeinefficient,owing to the joints and rivetholes becoming separated orenlarged, and thereby permitting a leakage of the contents. 3 5Heretofore it has been customary to rivet the brackets in positions-uponboth the inner and outer shells, the said brackets thus becomingpractically integral parts of both shells. By thus uniting the bracketsto the inner shell as well as the outer shell the expansion andcontraction of said inner shell will cause theseamsandrivet-holestoleak. In otherwords, the inner shell being rigidlysecured to the brackets, the expansion of said shell will cause therivets to become loose. The present invention overcomes thisseriousobjection, the said brackets being so placed within the digester thatthey aord a proper support for the weight of the inner shell and at the5o same time permit of a free expansion and contraction of the same.

Precedin g a detail description of the invention reference is made tothel accompanying drawing, which comprises a longitudinal verticalsectional elevation of a digester made in accordance with my invention.

In a detail description of my invention similar reference-lettersindicate corresponding parts.

. A designates the outer containing-shell of 6o the digester, having itsupper and lower ends terminating in conical; walls A', which are unitedto rings Al and A", through which ingress and egress are had to and fromthe interior of the digester.

B is the inner shell of the digester, having its upper end terminatingin conical walls B', with suitable space between'the inner and outershells, the said conical walls of the inner shell being likewise unitedto the rings 7o A. The bottom of the inner shell B being of conicalshape and called upon to support a great weight will in consequencethereof be subjected to some expansion and contraction lengthwise; butthe major degree of such expansion and contraction will be crosswise.

' The space C between the two shells is for the steam or watercirculation, as is well known.

O3 designates steam-inlet pipes communieating with the lower portionofthe cham- 8o ber C.

C4 is a casting arrangedabove the lower end of the apparatus and on theinterior thereof. This casting provides ducts B6 for the admission ofair or Water through pipe B7 85 for cleansing purposes and B3 fordrainage of condensed water. Y

B4 is a steam-inlet from the chamber C to an upright steam-drum B2.

B5 is an outlet for the drain of water. y

By alternately admitting steam between the two shells or in the innershell a degree of expansion and contraction manifests itself whenopposed by any rigidattachment of the l inner shell, as hereinbeforementioned. To 95 obviate this is one of the main objects of theinvention.

D designates a series of brackets which are annularly disposedaround'the lower interior of the outer shell. These brackets are rivrooeted or otherwise rigidly secured on the interior of the outer shell andhave their inner gin of said rim.

inclined faces D in such position as to receive the conical bottom ofthe inner shell, and thereby support said inner shell. These innerinclined faces D of said brackets have each an angle similar to theangle or inclination of the conical bottom B of said inner shell, sothat a proper contact is provided between said conical bottom and saidbrackets. It will be observed that these brackets have no attachmentwith said inner shell, while they serve as supports to hold said innershell in a central position within the outer shell. Owing to thismannerl of arranging said brackets the inner shell is free to contractand expand without any detrimental effects. The said inner shell incontracting and expanding will move at each end, thus causing the loweror supported end of said inner shell to contract and expand withoutbreaking or loosening the brackets. The result of this is that thedigester will be free from the wellknown defects of leakage and willremain in a serviceable condition for a much greater time thanheretofore.

The digester is inclosed at its upper end by a cover consisting of thefollowing parts:

E designates a iianged ring, which is suitably united to the upper ringA, which incloses or surrounds the opening or mouth of the digester.This tianged ring E has a series of slots arranged around its upper rim,said slots extending inwardly from the mar- Vithin said slots there arepivoted a series of bolts G, which are adapted to be lowered to ahorizontal position in said slots and to be raised to a verticalposition.

H designates a cover, which has a number of slots arranged around itsrim corresponding in number and position to the slots in the iiangedring E and into and out of which the bolts G are movable. When the saidbolts are elevated to the position shown in the drawing, the coverH istightened against the flanged ring E by means of nuts J, which aresecured on said bolts.

K is a pin having two diameters and penetrates openings in lugs L and Lon the cover H and the ring E. The said openings are also of twodiameters. V

N is a screw which screws against the upper end of the pin K, said screwhaving a screw-threaded engagement with the lug L. By means of thisscrew N the cover H may be slightly elevated from the ring E after thescrews G are lowered to a horizontal position, and the said cover may bethen swung around to one side of the opening or mouth of the digester.

The outlet from the interior of the digester is through a pipe or nozzleDX, which is secured to a cup D, the latter being riveted to the conicalend of the inner shell on one side thereof. The said nozzle DX is freeto move with the inner shell under the contracting and expandingmovements thereof, owing to said nozzle n ot being in rigid connectionwith anything but the inner shell. The said nozzle projects through theouter shell and through a flange D3, Vwhich is riveted to said outershell.` The said flange has a suitable space for a packing-ring, whichprovides a tight joint around the nozzle, which at the same time permitssaid nozzle to have the necessary movement in and out due to theexpansion and contraction of the inner shell. Other forms of connectionbetween the shells of the digester and the nozzle DX may be made wherebythe said nozzle will be allowed to have the necessary movement.

Having described my invention, I claiml. In a digester, the combinationwith inner and outer shells having conical-shaped ends, the saidconical-shaped ends being rigidly united, of a series of bracketsannularly disposed around the lower conical-shaped ends of said shells,said brackets having a rigid connection within the interior of the outershell and essentially free from any connection with the inner shell, theinner faces of said brackets being on angles coinciding with the conicalend of the inner shell and providing a support for said inner shellwhich permits said inner shell to freely contract and expand,substantially as set forth.

2. In a digester, the combination with inner and outer shellsterminating at both ends in conical shapes and united at such ends, thesaid inner and outer shells providing a steamchamber, a series ofsupportingbrackets annularly disposed in the lower portion of theapparatus, said brackets being rigidly united to the interior surface ofthe outer shell and having their surfaces coinciding with theinclination of the lower portion of the interior shell to provide asupport for said shell which permits of a free expansion and contractionof said inner shell, an outlet from the interior of the apparatuscomprising a cupshaped portion D", a nozzle DX secured to saidcup-shaped portion, a flange D3 secured around an opening in the outershell and through which said nozzle projects and is permitted to havemovement under the expanding and contracting actions of the inner shell,and a suitable packing-ring providing a joint at the point where saidnozzle projects through the :flange D3, substantially as set forth.

In testimony whereof I affix my signature in presence of two witnesses.

ARTHUR GIESLER.

Witnesses:

R. J. MGCARTY, JOHN W. KALBFUs.

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